Cutting, drawing, and measuring instrument.



G. T. CHANCELLOR. CUTT|NG,'DRAWING, AND MEASURING INSTRUMENT.

APPLICATION FILED SEPT-17.19l4.

Patented Nov. 9, 1915.

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GEORGE '1. CHANCELLOR, OF SARDIS, OKLAHOMA.

CUTTING, DRAWING, AND MEASURING INSTRUMENT.

Specification of Letters Patent.

Patented Nov. 9, 1915.

Application filed September 17, 1914. Serial No. 862,201.

To all whom, it may concern:

Be it known that I, GEORGE T. CHANGEL- LOR, a citizen of the United States, residing at Sardis, in the county of Pushmataha and State of Oklahoma, have invented certain new and useful Improvements in Cutting, Drawing, and Measuring Instruments, of which the following is a specification.

This invention relates to cutting, drawing and measuring instruments. It is a compound tool or implement in the form of a pocket knife, and is intended for the use of mechanics particularly, and it is useful to all persons mechanically inclined who have need to make miscellaneous measure ments, sketches or drawings.

The object of the invention is to produce a knife suitable for carrying in the pocket, the blades thereof being constructed to afford in one of their different positions a straight rule and measure, in another position a try square, and in other positions angular measures, the angles being read from a dial carried by the handle of the knife, and, also, from a scale inscribed upon one of the blades. It is customary in practice to provide this invention at one end with a magnifying glass set in the handle, and, it is also customary to pierce one or more of the blades with small holes through which the point of a lead pencil may be inserted, in order that circles of different radii may be drawn when desired, the handle of this invention being provided with a short projecting needle point employed to engage the paper at the center of the circle to be described.

The construction and arrangement of the parts in their preferred forms comprising this invention areillustrated in the accompanying drawings, of Which Figure 1 represents a side view of the side bearing the handle dial, and showing one of the blades open. Fig. 2 is a plan view from above, looking into the handle, the blade being open as in Fig. 1. Fig. 3 is a cross section upon the broken line a:m of Fig. 1. Fig. 4: is a cross-section upon the broken line g of Fig. 1. Fig. 5 is a cross-section upon the broken line 2-2 of Fig. 1. Fig. 6 is a side view with the end of the handle bearing the magnifying glass broken away upon the indirect line 7-7 of Fig. 2. In Fig. 6 both of the blades are shown open, and various positions of the blades are indicated'in broken lines. In this figure it is shown that diiferent blades open from difierent sides of the handle. Fig. 7 is a side view of. a blade removed from the handle. This view represents the blade which is provided with a scale for angular measurements as hereinafter set forth. Fig. 7 is introduced to more fully show the scale upon the blade.

. Throughout the drawings and description in this application the same letter is used to refer to the same part.

' Two leaves or plates A and a form the handle of this invention, and the plates are riveted together in the usual manner.

The blades B and 6 turn upon a common pivot pin C, and they are separated within the handle by an ordinary division plate or partition D. It will be noted in Figs. 1 and G, that the blades open from diiferent longitudinal edges of the handle, and, that the springs which control the blades are located upon different longitudinal edges of the handle. The spring E is associated with the blade B, and the spring 6 is provided for the blade 7). At the end of the handle nearest the tips of the blades when they are closed, the springs E and e are formed into rings F and f, and in the rings is placed a magnifying glass Gr. It will be understood that the division plate has also a suitable orifice for the glass G, and the sides of the handle are made with beveled openings H and h to retain the glass G and to permit the light to pass through the glass when in use.

An inch measure is inscribed upon the blades at their back edges, and, when the blade B is open and the blade Z) is closed, as illustrated in Fig. 1, there is presented a straight six-inch rule, applicable either for measuring purposes, or for drawing a straight line. In order to close or bridge the gap between inner ends or shoulders of the blades, thus enabling a continuous straight line to be drawn, there is provided an auxiliary plate (Z on the inside of the handle plate a, as illustrated in Figs. 1 and 2.

To describe circles of different radii, one or both of the blades are pierced by the small holes J as shown in the blade B, and the end of the pivot C of the blades has a small needle point 7', projecting far enough to permit it to be pressed down into a sheet of paper, but, not far enough to cause it to catch in and tear the pocket in which this invention may be carried.-

On the end of the handle and concentric with the pivot G is a dial K, having the scale of degrees is. The dial plate K is fixed to the handle. WVithin the dial plate, which is of angular construction, there is placed a revoluble disk that is fixed upon the squared any suitable manner.

sleeve L encircling thepivot pin 0. The revoluble disk is marked M and the blade B is secured to it, either by soldering, or in It is thought to be clear that the sleeve, and, consequently, the disk M will turn when the blade B is opened or closed. The disk M is provided with an arrowhead mark on to point to the scale 70 and indicate the angles to which the blade B may be turned with reference to the blade 6.

The angle measured is that included between the straight back edges of the blades, those edges being inscribed with inch marks as illustrated. To indicate the degree of an angle less than a right angle on the scale 72, the blade Z) is fully opened until it is in line with the handle, as shown in Fig. 6

in broken lines. The blade B is then partly closed until the arrowhead m points on the scale to the angle desired.

In Fig. 7 there is best shown the degree scale N stamped upon the blade 6.

In explaining the operation of this invention, attention is called to the fact that the blades, while having a common pivot, open from opposite longitudinal edges of the handle. When the blade B has been opened into the position illustrated in Fig. 1, this invention affords to the user a six inch straight line rule. As the blade B is moved from its opened into its closed position indicated by broken lines in Fig. 6, the pointer mark m moves into coincidence with the divisions of the degree scale in. Let it be assumed that the blade B is opened asillustrated in Fig. 1, and that it is desired to draw a relatively small angle, for example, an angle of ten, twenty, or thirty degrees. A straight line is drawn along the graduated backs of the blades, and the blade B then partly closed until the angle sought is indicated upon the scale is.

Y Vhen either of the blades is moved in the ninety degree position at right angles closed this invention .is usable as a try square, as will be readily understood by any mechanic.

When the blade I) is partlyopened, angles greater than ninety degrees may be indicated by the scale N. In order that the measure of an angle greater than ninety degrees may be taken between the straight back edges, the blades must be arranged as shown in Fig. 6. That is to say, the blade B must be fully opened and in line with the handle, and the blade Z) must be partly opened. hen the blade I) occupies its fully opened position, as shown in broken lines in Fig. 6, any angle less than ninety degrees will be pointed out by the mark m and shown on the scale is, as the blade B is moved toward its closed position. It will be understood that when either blade is partly opened and its movement-is resisted or influenced by the spring E or e, the blade must be held by the hand in position until the angle is measured. That is readily done by holding the handle with one hand and opening the blade with the other hand.

The magnifying glass G is fully protected by the plates of the handle, and, is found to be very useful in a, variety of ways.

Having now described this explained the mode of its operation, what I claim is 1. An instrument of the character described, comprising a handle, two pivoted invention and 7 blades opening from different longitudinal V edges of the handle, and springs arranged on different longitudinal edges of the handle and bearing against the pivoted ends of the blades, the said blades being constructed to engage the springs whereby the blades are yieldingly held either open or closed, the back edges of thesaid blades forming a straightline rule when one blade is fully opened and one is fully closed.

2. An instrument of the, character described, comprising a handle, two pivoted blades opening from different longitudinal edges of the handle, springs arranged on different longitudinal edges sides .of the handle and bearing against the pivoted ends of the blades, a degree scale secured to the said handle, and means actuated by one of the said blades for indicating the angles into which the said blade may be moved with respect to the other blade.

3. An instrument of the character deedges of. the handle, springs arranged on 7 different longitudinal edges sides of the handle and bearing against the pivoted ends of the blades, a degree scaleborne by one of the said blades, and means actuated by the other blade and having a pointer mark arranged to indicate upon the said scale the angular position of the said scale-bearing blade With respect to the other blade When the last mentioned blade is in a predeter- 5 mined position.

4. An instrument of the character described, comprising a handle, two pivoted blades opening from difierent longitudinal edges of the handle, springs arranged on 10 different longitudinal edges sides of the handle and bearing against the pivoted ends of the blades, and angle-indicating means for setting forth the angles between the blades in different positions of the blades.

In testimony whereof I aflix my signa- 15 ture in presence of tWo Witnesses.

GEO. T. CHANCELLOR. Witnesses:

GEORGE J. JOHNSTON, CHAs. A. APPLEBY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

